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If the brake light switch is bad, both brake lights would be out, so don't change it. Check the brake light socket to see if there is any corrosion inside, which is usually the problem. Use a piece of sandpaper folded over and push back and forth with a small screwdriver to clean up contact in socket. To prevent corrosion in the future, pick up some dielectric grease at any parts store, and place a bit in the socket. If corrosion isn't the problem, you need to check the socket with a voltage meter to see if there is power to the socket when brakes are applied. If not, you will have to trace wires back to find where the problem is.

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It may not need to be replaced, just adjusted. The switch is located under the driver's dash. You'll have to get down low with a flashlight and follow the brake pedal arm up until you see the switch. As you look, gently press the brake pedal and see how the pedal arm pushes against the switch. The switch has a nut which you can loosen, allowing you to move the switch closer to the pedal or further away. The nut then must be tightened securely so that the switch will stay at the proper adjustment. The switch has to be close enough to the pedal arm so that when the brake is pressed, the switch plunger makes contact. If it looks this is already happening, replace the switch and adjust the new switch as above.

First check the fuse and replace if it is blown. If fuse is OK, then it sounds like the brake light switch has failed. It is located on a bracket under the dash near the top of the brake pedal arm. You could put a bridging wire across the terminals to confirm if the switch is out and the rest of the wiring is OK. If the lights then work replace the switch.

First, replace bulbs and then check brake light switch, which is located near the top of the brake pedal. Use a voltimeter or test light to verify that there's voltage at the switch connector. It's not bad idea to replace brake light switch. Also make sure the brake pedal is correctly adjusted.

I have a 2001 Ford F150, my brake lights dont work. Ive replaced the bulbs, checked the fuses,and the brake switch on side of the brake pedal was replaced. I still dont have any brake lights. My third brake light works fine, along with my running lights,flashers, blinkers.

If the brake light switch is bad, both brake lights would be out, so don't change it. Check the brake light socket to see if there is any corrosion inside, which is usually the problem. Use a piece of sandpaper folded over and push back and forth with a small screwdriver to clean up contact in socket. To prevent corrosion in the future, pick up some dielectric grease at any parts store, and place a bit in the socket. If corrosion isn't the problem, you need to check the socket with a voltage meter to see if there is power to the socket when brakes are applied. If not, you will have to trace wires back to find where the problem is.